Noise measurement technique for document scanners

1996 ◽  
Author(s):  
Xiaofan Feng ◽  
John T. Newell ◽  
Roger Triplett
Keyword(s):  
Measurement Technique ◽  
Noise Measurement

scholarly journals Nonlinearity Measurements Using Alternating Current

1978 ◽  
Vol 5 (2) ◽  
pp. 91-98 ◽  
Author(s):  
Vladimír Ryšánek ◽  
Carlo Corsi ◽  
Arnaldo d'Amico
Keyword(s):  
Frequency Band ◽  
Measurement Technique ◽  
Alternating Current ◽  
Noise Measurement ◽  
Wide Frequency Band ◽  
Semiconductor Structures ◽  
Different Types ◽  
Homogeneous Structures ◽  
Lock In

The nonlinearity measurement technique described uses an adapted conventional lock-in-amplifier. This technique enables us to measure small nonlinearities over a wide frequency band and is more sensitive than the 1/f noise measurement used to detect non-homogeneous structures in conductors, resistors and semiconductor components. Results illustrating uses of this method are presented for different types of resistor and semiconductor structures.

scholarly journals Wideband Noise Measurement Technique in Duplex Systems for RF Interference

2018 ◽  
Vol 60 (4) ◽  
pp. 1038-1044 ◽  
Author(s):  
Chulsoon Hwang ◽  
David Pommerenke ◽  
Jun Fan ◽  
Takashi Enomoto ◽  
Junji Maeshima ◽  
...  
Keyword(s):  
Measurement Technique ◽  
Noise Measurement ◽  
Wideband Noise ◽  
Duplex Systems

scholarly journals Highly-Sensitive Phase and Frequency Noise Measurement Technique Using Bayesian Filtering

2019 ◽  
Vol 31 (23) ◽  
pp. 1866-1869 ◽  
Author(s):  
Darko Zibar ◽  
Hou-Man Chin ◽  
Yeyu Tong ◽  
Nitin Jain ◽  
Joel Guo ◽  
...  
Keyword(s):  
Measurement Technique ◽  
Noise Measurement ◽  
Frequency Noise ◽  
Bayesian Filtering ◽  
Highly Sensitive ◽  
Sensitive Phase

Development of Technologies for Eliminating High-Level Noise Emitting Vehicles on Japanese Roads

2008 ◽  
Author(s):  
Masao Ishihama ◽  
Shigehiko Kaneko ◽  
Minoru Kamata ◽  
Takeharu Tanaka ◽  
Ichiro Sakamoto
Keyword(s):  
Measurement Technique ◽  
Noise Level ◽  
Subjective Evaluation ◽  
Noise Measurement ◽  
Original Position ◽  
Operation Condition ◽  
Engine Operation ◽  
Vehicle Acceleration ◽  
Exhaust Noise ◽  
High Level

The purpose of the present study is to improve the on-street exhaust noise measurement technique for regulating vehicles that emit unacceptably large exhaust noise. The method under development uses racing operation of engines with a wide-open throttle on a standing vehicle. In contrast, the engine operation condition considered in the conventional on-street measurement technique considers operation at 75% of rated power followed by the throttle valve being released to its original position. The current regulation considers the maximum noise level during this engine operation condition. Accordingly, the engine is not loaded during testing. This loading condition provides unsatisfactory correlation between the exhaust noise level measured by the on-street method and the ISO vehicle acceleration noise under the wide-open throttle condition. The present paper reports the advantages of the proposed method as well as some important factors in the proper application of the newly proposed method. In the present study, we perform noise measurement along highways, a vehicle experiment in an anechoic chassis dynamometer, and computer simulations. The results revealed that the proposed on-street measurement method can be used to approximately determine the exhaust noise level during full acceleration for most vehicle types. In addition, the sensitivities of the measured noise levels for the testing conditions were clarified. The second item in this study is efficient engine speed measurement using exhaust sound signal only without electric wire harnessing. A survey of the measurement systems proposed by three different companies revealed that the measurement principles of two of these systems have potential application to on-street exhaust measurement. The last item investigated herein is better indices of exhaust noise evaluation. Loudness defined by ISO was found to be much better than the conventional dB(A) scale in terms of correlation with subjective evaluation results.

Accurate Millimeter-Wave Laser Phase Noise Measurement Technique

2013 ◽  
Vol 25 (13) ◽  
pp. 1218-1221 ◽  
Author(s):  
Ramin Khayatzadeh ◽  
Habeb Rzaigui ◽  
Julien Poette ◽  
Beatrice Cabon
Keyword(s):  
Phase Noise ◽  
Millimeter Wave ◽  
Measurement Technique ◽  
Noise Measurement ◽  
Wave Laser
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